Perhaps you should try some spelling variations:
te sach » toc sach
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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 v nang x hoi. hieu va cam ((duc va) or (tuc xa)) thanh ((di cua) or (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang x hoi. hieu va cam ((duc va) OR (tuc xa)) thanh ((di cua) OR (de cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach v nang x hoi. hieu va cam ((duc va) or (tuc xa)) thanh ((di cua) or (de cua)) te*.