Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
nam xuc » cam xuc, nam thuc, nam duoc
nam xua » nam cua, nam mua, nam qua
vien ca » vien cac, vien cao, vien can
ca viet » va viet, co viet, hoa viet

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 van ((nam xuc) or (nam xua)) ((va thanh) or (ban thanh)) vien ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van ((nam xuc) OR (nam xua)) ((va thanh) OR (ban thanh)) vien ca viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van ((nam xuc) or (nam xua)) ((va thanh) or (ban thanh)) vien ca viet*.