Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang van » dang van, tang van, lang van
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, tu cach
te sach » toc sach
van hoc » van hoa
qua nam » quan nam, cua nam, quang nam
cua tre » cua te, cuu tre, dua tren

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 (te sach)) ky nang van hoc. hieu qua nam thuc vat hanh dao ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang van hoc. hieu qua nam thuc vat hanh dao ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang van hoc. hieu qua nam thuc vat hanh dao ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang van hoc. hieu qua nam thuc vat hanh dao ((cua tre) OR (cua triet))*.