Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
van nang » van quang, van ban, van dong
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
su sach » so sach
vu sach » vu bach, vu khach
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, voi nang
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ((v nang) OR (van nang)) xa hoi. hieu va cam thuc dan thanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ((v nang) OR (van nang)) xa hoi. hieu va cam thuc dan thanh doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ((v nang) OR (van nang)) xa hoi. hieu va cam thuc dan thanh doi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ((v nang) OR (van nang)) xa hoi. hieu va cam thuc dan thanh doi cua tu*.