Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va, hieu ve
hanh lam » thanh lap, hanh kem, hanh va
tang van » dang van, hoang van, trong van
hieu va » lieu va, hieu qua
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
van hoc » van hoa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
xu va » xu van, tu va, su va

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 (thuoc sach)) ky tang van hoc. ((hieu van) OR (hieu va)) chao xu va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky tang van hoc. ((hieu van) OR (hieu va)) chao xu va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) ky tang van hoc. ((hieu van) OR (hieu va)) chao xu va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky tang van hoc. ((hieu van) OR (hieu va)) chao xu va hanh lam cua tre*.