Perhaps you should try some spelling variations:
hanh sai » hanh san, hanh tai, thanh san
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
lang ha » long ha
y lang » o lang, _ lang, tay lang
van am » van nam, van lam, van dam
ha hoi » hoa hoi, ha noi, xa hoi
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 y lang ha hoi. hieu van am thuc va ((hanh sai) OR (danh sai)) ((va trien) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang ha hoi. hieu van am thuc va ((hanh sai) OR (danh sai)) ((va trien) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y lang ha hoi. hieu van am thuc va ((hanh sai) OR (danh sai)) ((va trien) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y lang ha hoi. hieu van am thuc va ((hanh sai) OR (danh sai)) ((va trien) or (cua te))*.