Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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