Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
thien van » thi van
nang doc » nang luc
te sach » toc sach
ma hanh » va hanh, da hanh, na hanh
thuc ma » thuoc ma, thuc va, thuc ha
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang noi, nang hoc
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ty ((nang co) OR (nang doc)) hoi. ((hieu va) or (thien van)) nhan thuc ma hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang co) OR (nang doc)) hoi. ((hieu va) OR (thien van)) nhan thuc ma hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang co) OR (nang doc)) hoi. ((hieu va) or (thien van)) nhan thuc ma hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang co) OR (nang doc)) hoi. ((hieu va) or (thien van)) nhan thuc ma hanh vi cuu tre*.