Perhaps you should try some spelling variations:
sach tham » sach nha
tham lang » nham nang, pham hang, thai bang
chat truc » chat xuc
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ca hoi » cua hoi, xa hoi, co hoi

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