Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
dat duoc » dat nuoc, da duoc, luat duoc
nam duoc » nam thuoc, da duoc, nam moc
sach kem » hanh kem
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa

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 kem) or (sach y)) nang ma hoi. thien van ((nam duoc) OR (dat duoc)) va hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach y)) nang ma hoi. thien van ((nam duoc) OR (dat duoc)) va hanh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach y)) nang ma hoi. thien van ((nam duoc) OR (dat duoc)) va hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach y)) nang ma hoi. thien van ((nam duoc) OR (dat duoc)) va hanh dai cua viet*.