Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai hoa » van hoa, va hoa, dai hoa
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (v nang)) xa hoi. ((hieu va) or (hieu van)) nam tu va hanh vai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. ((hieu va) OR (hieu van)) nam tu va hanh vai hoa viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) xa hoi. ((hieu va) or (hieu van)) nam tu va hanh vai hoa viet*.