Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chat truc » cau truc, chat xuc
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
dai sua » dai cua
va dan » ca dan, va dao, va dau
dai su » dai so, dan su, lai su

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 ((chat truc) or (chao xu)) va dan ((dai su) OR (dai sua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu van ((chat truc) OR (chao xu)) va dan ((dai su) OR (dai sua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. hieu van ((chat truc) or (chao xu)) va dan ((dai su) OR (dai sua)) triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu van ((chat truc) or (chao xu)) va dan ((dai su) OR (dai sua)) triet*.