Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ky tang » ky nang, ky dang, kho tang
dan vai » dan va, dan tai, dan vat
cac tuc » cac toc, cac tu, cac tac
qua cac » cua cac
tu sach » thu sach, su sach, tu cach
ky lang » ky nang, ky dang, tay lang
te sach » toc sach
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
vai su » va su, van 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: ((tu sach) OR (te sach)) ((ky lang) or (ky tang)) xa hoi. hieu qua cac tuc va dan vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ky lang) OR (ky tang)) xa hoi. hieu qua cac tuc va dan vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((ky lang) or (ky tang)) xa hoi. hieu qua cac tuc va dan vai su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((ky lang) or (ky tang)) xa hoi. hieu qua cac tuc va dan vai su triet*.