Perhaps you should try some spelling variations:
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ban anh » ban hanh, ban banh, ban danh
nam qua » nam quan, nam cua, nam mua
cua tre » cua te, cuu tre, cua triet
nam xua » nam cua, nam mua, nam luat
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
anh vi » hanh vi, anh va, anh ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu va ((nam xua) or (nam qua)) ban anh vi ((dua tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va ((nam xua) OR (nam qua)) ban anh vi ((dua tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va ((nam xua) or (nam qua)) ban anh vi ((dua tren) or (cua tre))*.