Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
ve triet » va trien, su triet
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem

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) or (hoc sach)) va nang xa hoi. ((hieu va) or (lieu va)) cam duc va hanh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) va nang xa hoi. ((hieu va) OR (lieu va)) cam duc va hanh de ve triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) va nang xa hoi. ((hieu va) or (lieu va)) cam duc va hanh de ve triet*.