Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dang tai » dang thai, dung tai, hang tai
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va dang » van dang, va nang, va lang
cuc » cuoc, chuc
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 ty) or (sach y)) nang xa hoi. hieu va cac nuoc va dang tai cuc thue~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach y)) nang xa hoi. hieu va cac nuoc va dang tai cuc thue.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) or (sach y)) nang xa hoi. hieu va cac nuoc va dang tai cuc thue*.