Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
thai va » thai van
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
va phan » van phan, va phat, va phap
tuc va » thuc va, truc va, tuc xa
tai va » mai va, tri va, tai ba
dai va » mai va
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van cam tuc va phan ((((tai va) OR (dai va))) or (thai va)) thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cam tuc va phan ((((tai va) OR (dai va))) OR (thai va)) thieu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van cam tuc va phan ((((tai va) OR (dai va))) or (thai va)) thieu*".