Perhaps you should try some spelling variations:
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, cac nuoc, cac cuoc
sach ty » sach y, sach tu, sach thu
lang ha » long ha
nang ma » tang ma, sang ma, nang cao
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 ha)) hoi. hieu qua ((cac luc) OR (coc luc)) va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (lang ha)) hoi. hieu qua ((cac luc) OR (coc luc)) va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang ma) or (lang ha)) hoi. hieu qua ((cac luc) OR (coc luc)) va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (lang ha)) hoi. hieu qua ((cac luc) OR (coc luc)) va hanh di cua tre*.