Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham loc » tham nuoc, cham soc, hau loc
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
luy tre » luyen tre
va hanh » van hanh, va thanh, va danh
te sac » te sach, te cac, te san
loc va » hoc va, luc va
sac ky » cac ky, sai ky
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 sac ky lang ha hoi. ((hieu quan) or (hieu qua)) tham loc va hanh vi ((luy tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. ((hieu quan) OR (hieu qua)) tham loc va hanh vi ((luy tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. ((hieu quan) or (hieu qua)) tham loc va hanh vi ((luy tre) or (cua tre))*.