Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » thien van, lieu va, hieu ve
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va dang » van dang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. ((hieu van) or (hieu va)) cac nuoc va dang ((than cua) OR (thai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. ((hieu van) OR (hieu va)) cac nuoc va dang ((than cua) OR (thai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. ((hieu van) or (hieu va)) cac nuoc va dang ((than cua) OR (thai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. ((hieu van) or (hieu va)) cac nuoc va dang ((than cua) OR (thai cua)) te*.