Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hang ha » hang hoa, hang hai, hoang ha
tu hang » thu hang, tu hanh, tu hung
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu hang ha hoi. ((hieu quan) or (hieu qua)) cam xuc ((va danh) or (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu hang ha hoi. ((hieu quan) OR (hieu qua)) cam xuc ((va danh) OR (van hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu hang ha hoi. ((hieu quan) or (hieu qua)) cam xuc ((va danh) or (van hanh)) vai cua tre*.