Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dang tai » dang thai, dung tai, hang tai
cuc tieu » muc tieu, cac tieu, cach tieu
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 te » cua te, cuc thue

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 te) OR (cuc tieu))~.
• 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 te) OR (cuc tieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) or (sach y)) nang xa hoi. hieu va cac nuoc va dang tai ((cuc te) OR (cuc tieu))".
• 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 te) OR (cuc tieu))*.