Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
cham xuc » cam xuc, chat xuc, cham soc
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
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: tu sach ty nang xa hoi. ((hieu van) OR (lieu va)) cham xuc ((va hanh) or (gia thanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu van) OR (lieu va)) cham xuc ((va hanh) OR (gia thanh)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu van) OR (lieu va)) cham xuc ((va hanh) or (gia thanh)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu van) OR (lieu va)) cham xuc ((va hanh) or (gia thanh)) vi cua viet*.