Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
vanh dai » van dai, vanh tai, lanh dao
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, dua tren
va vanh » va van, va danh, va hanh
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) y nang mai khoi. hieu ve cau luc va vanh dai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai khoi. hieu ve cau luc va vanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang mai khoi. hieu ve cau luc va vanh dai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang mai khoi. hieu ve cau luc va vanh dai ((cua tre) or (cua triet))*.