Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
hang lai » hang tai, hang hai, hang loi
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
van pham » san pham, van phan, van phat
lai cua » dai cua, hai cua, lai chau
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
ly hang » ly quang
ly vang » ly van, ly quang
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 vang) or (ly hang)) cao hoi. hieu van pham thuc dan hang lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly vang) OR (ly hang)) cao hoi. hieu van pham thuc dan hang lai cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((ly vang) or (ly hang)) cao hoi. hieu van pham thuc dan hang lai cua te*.