Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » thien van, lieu va, hieu ve
bac nuoc » cac nuoc, bach tuoc, sach nuoc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va dung » van dung, va duong, vat dung
cuc te » cua te, cuc tieu
thue » thu, thuc, thuy

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)) bac nuoc va dung tai ((cuc te) or (cuc thue))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. ((hieu van) OR (hieu va)) bac nuoc va dung tai ((cuc te) OR (cuc thue)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. ((hieu van) OR (hieu va)) bac nuoc va dung tai ((cuc te) or (cuc thue))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. ((hieu van) OR (hieu va)) bac nuoc va dung tai ((cuc te) or (cuc thue))*.