Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
pham thuc » phap thuc, pham chuc, nham thuc
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hoc hoi » hoc khoi, hoc hoa, hoc noi
sach ky » sac ky, sach y, sach ty
doc hoi » duoc hoi, doc hai, doi hoi
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang ((doc hoi) or (hoc hoi)). hieu van pham thuc day hanh ((di cua) or (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((doc hoi) OR (hoc hoi)). hieu van pham thuc day hanh ((di cua) OR (de cua)) te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((doc hoi) or (hoc hoi)). hieu van pham thuc day hanh ((di cua) or (de cua)) te*.