Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau phuc » cau truc, chau phu, huu phuc
cua tre » cua te, cuu tre, dua tren
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
phuc va » phuc vu, thuc va, chuc va
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
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 y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoa. ((hieu ve) OR (hieu va)) cau phuc va tinh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di ((cua tre) OR (cua triet))*.