Perhaps you should try some spelling variations:
qua tham » qua cham, qua than, qua thanh
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
vai cua » dai cua, hai cua, lai cua
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cac ky lang ha hoi. hieu qua tham ((soc va) or (doc va)) hanh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cac ky lang ha hoi. hieu qua tham ((soc va) OR (doc va)) hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ve cac ky lang ha hoi. hieu qua tham ((soc va) or (doc va)) hanh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: ve cac ky lang ha hoi. hieu qua tham ((soc va) or (doc va)) hanh ((vi cua) OR (vai cua)) te*.