Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xuc va » tuc va, luc va, xac va
vai va » mai va, dai va, lai va
hai va » hai van, thai va, hoi va

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 ky nang xa hoi. hieu ve cham ((xuc va) OR (duc va)) danh ((vai va) or (hai va)) thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve cham ((xuc va) OR (duc va)) danh ((vai va) OR (hai va)) thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve cham ((xuc va) OR (duc va)) danh ((vai va) or (hai va)) thieu".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve cham ((xuc va) OR (duc va)) danh ((vai va) or (hai va)) thieu*.