Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh dai » trinh dai, tinh hai, tinh doi
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, dua tren
tinh da » tinh va, tinh gia, tinh lao
te sach » toc sach
cam luc » cam xuc, cau luc
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
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: te sach y nang mai hoi. hieu van cam luc va ((tinh dai) OR (tinh da)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang mai hoi. hieu van cam luc va ((tinh dai) OR (tinh da)) ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang mai hoi. hieu van cam luc va ((tinh dai) OR (tinh da)) ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang mai hoi. hieu van cam luc va ((tinh dai) OR (tinh da)) ((cua tre) or (cua triet))*.