Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
va cua » va chua, via cua, ca cua
cua te » cua tu

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) OR (vu sach)) ty nang xa hoi. hieu van cam ((duc va) or (truc va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang xa hoi. hieu van cam ((duc va) OR (truc va)) hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty nang xa hoi. hieu van cam ((duc va) or (truc va)) hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty nang xa hoi. hieu van cam ((duc va) or (truc va)) hanh va cua te*.