Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
chat duc » chat xuc, chat doc, chet duoc
hanh lai » hanh lam, hanh tai, thanh lap
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu san, tu bac
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu cac)) ky sang ma hoi. ((hieu van) OR (hieu va)) chat duc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky sang ma hoi. ((hieu van) OR (hieu va)) chat duc va hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu cac)) ky sang ma hoi. ((hieu van) OR (hieu va)) chat duc va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky sang ma hoi. ((hieu van) OR (hieu va)) chat duc va hanh lai cua tre*.