Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
nam thuc » nam thuoc, am thuc, nam thu
hanh via » hanh vi, hanh va, anh va
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, dam thuc
sach ty » sach y, sach tu, sach thu
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach thue)) dang xay hoi. hieu van ((cam tuc) or (nam thuc)) va hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thue)) dang xay hoi. hieu van ((cam tuc) OR (nam thuc)) va hanh via cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thue)) dang xay hoi. hieu van ((cam tuc) or (nam thuc)) va hanh via cua tre*.