Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
chau phu » chau phi, chau au, chau tho
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
phu va » phuc va, phu la, phu da

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ly nang xa hoi. ((hieu van) OR (lieu va)) chau phu va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang xa hoi. ((hieu van) OR (lieu va)) chau phu va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang xa hoi. ((hieu van) OR (lieu va)) chau phu va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang xa hoi. ((hieu van) OR (lieu va)) chau phu va hanh vai cua tre*.