Perhaps you should try some spelling variations:
dau nuoc » dat nuoc, dau ngoc, cap nuoc
lang van » dang van, tang van, hoang van
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va dau » va dao
cua te » cua tu

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 (lang van)) hoi. hieu va dau nuoc va hanh de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (lang van)) hoi. hieu va dau nuoc va hanh de ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (lang van)) hoi. hieu va dau nuoc va hanh de ((cua tre) or (cua te))*.