Perhaps you should try some spelling variations:
tang luan » dung luan
tang dai » tang tai, tang dan, lang dai
hieu vu » hieu va, hieu ve, hieu su
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
vi cua » vai cua, di cua
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((tang dai) or (tang luan)) hoi. ((hieu vu) or (hieu qua)) cam tuc va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((tang dai) OR (tang luan)) hoi. ((hieu vu) OR (hieu qua)) cam tuc va hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((tang dai) or (tang luan)) hoi. ((hieu vu) or (hieu qua)) cam tuc va hanh vi cua tu*.