Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat lanh, thuat xay
phat xuc » chat xuc, phat xuat, phap xu
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dao vai » dao van, dao va, dao bai
xuc va » duc va, tuc va, luc va
va dao » ca dao
vai va » mai va, dai va, hai va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (((thuat san) OR (thuat song)))) ky nang xa hoi. hieu va phat xuc va dao vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((thuat san) OR (thuat song)))) ky nang xa hoi. hieu va phat xuc va dao vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((thuat san) OR (thuat song)))) ky nang xa hoi. hieu va phat xuc va dao vai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((thuat san) OR (thuat song)))) ky nang xa hoi. hieu va phat xuc va dao vai va thiet*.