Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vanh tai » hanh tai, anh tai, vanh dai
van tai » von tai, van tuan
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
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 (su sach)) ty nang ma hoi. hieu van cau tuc va ((vanh tai) or (van tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ty nang ma hoi. hieu van cau tuc va ((vanh tai) OR (van tai)) va thiet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ty nang ma hoi. hieu van cau tuc va ((vanh tai) or (van tai)) va thiet*.