Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
cua viet » ca viet, hoa viet, cua vat
nang dac » nang doc, nang dau, nang dan
dac khoa » da khoa, dai khoa, dau khoa
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 tu nang dac khoa. ((hieu viec) or (hieu ve)) bach ((xuc va) OR (luc va)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang dac khoa. ((hieu viec) OR (hieu ve)) bach ((xuc va) OR (luc va)) hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang dac khoa. ((hieu viec) or (hieu ve)) bach ((xuc va) OR (luc va)) hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang dac khoa. ((hieu viec) or (hieu ve)) bach ((xuc va) OR (luc va)) hanh vai cua viet*.