Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
hang vai » hang va, hang tai, hang hai
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
ly quang » le quang, vu quang
van pham » san pham, van phan, van phat
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
cao hoi » cau hoi, co hoi, cao hoc
ly vang » ly van
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) OR (ly quang)))) cao hoi. hieu van pham thuc dan hang vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly vang) OR (((ly hang) OR (ly quang)))) cao hoi. hieu van pham thuc dan hang vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly vang) or (((ly hang) OR (ly quang)))) cao hoi. hieu van pham thuc dan hang vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly vang) or (((ly hang) OR (ly quang)))) cao hoi. hieu van pham thuc dan hang vai cua te*.