Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
te sach » toc sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
cua te » cua tu
y lang » o lang, _ lang, tay lang

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 (te sach)) y lang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y lang xa hoi. ((hieu ve) OR (hieu va)) cau truc va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y lang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y lang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh lai cua te*.