Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
va triet » va thiet, va trien, ve triet
phat xuc » chat xuc, phat xuat, phap xu
hieu va » lieu va, hieu qua
te sach » toc sach
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa
vi va » vi van, vai va, vu va

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)) ky nang ((o hoi) OR (co hoi)). hieu va phat xuc va dan vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat san)) ky nang ((o hoi) OR (co hoi)). hieu va phat xuc va dan vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat san)) ky nang ((o hoi) OR (co hoi)). hieu va phat xuc va dan vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat san)) ky nang ((o hoi) OR (co hoi)). hieu va phat xuc va dan vi va triet*.