Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thai son » thai den, thai do, thai hoc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
lua tre » cua tre, luy tre, dua tren
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sai ky » sac ky
vi lua » vi luu
te sai » te tai, te bai, te lai

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

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