Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
ha hoi » hoa hoi, ha noi, va hoi
va lam » van lam, va lap
va am » va cam
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky tang ((ha hoi) OR (xa hoi)). lieu ((va am) or (va lam)) thuc vat hanh kem su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang ((ha hoi) OR (xa hoi)). lieu ((va am) OR (va lam)) thuc vat hanh kem su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang ((ha hoi) OR (xa hoi)). lieu ((va am) or (va lam)) thuc vat hanh kem su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang ((ha hoi) OR (xa hoi)). lieu ((va am) or (va lam)) thuc vat hanh kem su triet*.