Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham soc » cham soc, tham nuoc, thai son
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
lua tre » cua tre, luy tre, dua tren
sac ky » sai ky
soc va » hoc va, loc va, doc va
vi lua » vi luu

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) OR (cac ky)) lang xa hoi. ((hieu quan) or (hieu qua)) tham soc va hanh vi lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (cac ky)) lang xa hoi. ((hieu quan) OR (hieu qua)) tham soc va hanh vi lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) OR (cac ky)) lang xa hoi. ((hieu quan) or (hieu qua)) tham soc va hanh vi lua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) OR (cac ky)) lang xa hoi. ((hieu quan) or (hieu qua)) tham soc va hanh vi lua tre*.