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 » tang ma, sang ma, nang cao
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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 va cac ((luc va) or (tuc 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 va cac ((luc va) OR (tuc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (lang ha)) hoi. hieu va cac ((luc va) or (tuc va)) hanh di cua tre*.