Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh via » hanh vi, hanh va, anh va
te sach » toc sach
via cua » gia cua, gian cua, giau cua
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
luc va » duc va, tuc va, loc va
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: te sach ((ly nang) OR (ly hang)) xa hoi. hieu van cam ((luc va) or (thuc va)) hanh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly nang) OR (ly hang)) xa hoi. hieu van cam ((luc va) OR (thuc va)) hanh via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly nang) OR (ly hang)) xa hoi. hieu van cam ((luc va) or (thuc va)) hanh via cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly nang) OR (ly hang)) xa hoi. hieu van cam ((luc va) or (thuc va)) hanh via cua te*.