Perhaps you should try some spelling variations:
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
thanh cau » thanh chau, thanh mau, nhanh cau
chat huu » pham huu
lai sua » dai sua, lai cua, luat sua
xa hanh » xa thanh, xa khanh, va hanh
ca chat » cao chat, cac chat, va chat
hieu ca » hieu cac, hieu cua, hieu va
huu xa » huu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) OR (tu cac)) thuc thanh cau hoi. hieu ca chat huu xa hanh ((lai su) or (lai sua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu cac)) thuc thanh cau hoi. hieu ca chat huu xa hanh ((lai su) OR (lai sua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) OR (tu cac)) thuc thanh cau hoi. hieu ca chat huu xa hanh ((lai su) or (lai sua)) triet*".