Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
nam xuc » nam xua, nam thuc, nam duoc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
vi cua » vai 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: su ((sac ky) or (sach ty)) nang xa hoi. hieu va ((nam xuc) or (cam xuc)) va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach ty)) nang xa hoi. hieu va ((nam xuc) OR (cam xuc)) va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach ty)) nang xa hoi. hieu va ((nam xuc) or (cam xuc)) va hanh vi cua viet*.