Perhaps you should try some spelling variations:
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cau tre » cau tren, cau treo, cau tra
va lam » van lam, va lap
luc va » duc va, tuc va, loc va
di cau » da cau, diem cau

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 ma) or (tang ma)) hoi. hieu va lam ((luc va) or (hoc va)) hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (tang ma)) hoi. hieu va lam ((luc va) OR (hoc va)) hanh di cau tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (tang ma)) hoi. hieu va lam ((luc va) or (hoc va)) hanh di cau tre*.