Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
han thai » han tai, ban thai, van thai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
thai va » thai van
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. hieu van cam ((xuc va) OR (duc va)) han thai va (thiet or thieu)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van cam ((xuc va) OR (duc va)) han thai va (thiet OR thieu).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu van cam ((xuc va) OR (duc va)) han thai va (thiet or thieu)".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van cam ((xuc va) OR (duc va)) han thai va (thiet or thieu)*.