Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang hai » dang khai, hang hai, dung hai
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ca viet » va viet, co viet, hoa viet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
hai ca » hai cua, hai ba, bai ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (toc sach)) ky nang xa hoi. hieu ve cham ((xuc va) OR (tuc va)) dang hai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky nang xa hoi. hieu ve cham ((xuc va) OR (tuc va)) dang hai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (toc sach)) ky nang xa hoi. hieu ve cham ((xuc va) OR (tuc va)) dang hai ca viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky nang xa hoi. hieu ve cham ((xuc va) OR (tuc va)) dang hai ca viet*.