Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
cap nuoc » dat nuoc
dang tai » dang thai, dung tai, dang thi
hang tai » hang va, dung tai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuc te » cua te, cuc thue, cuc tieu

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