Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh hai » thanh hai, nhanh hai, hang hai
vat hanh » vat thanh, van hanh, va hanh
thi nang » thi cong, ki nang, thi hanh
nang lai » nang tai, mang lai, nang cai
so sach » co sach, hoc sach
hai cua » thai cua, dai cua, hoi cua
ve pham » vi pham, v pham, ve phan
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
so sanh » do sanh
bo sach » co sach, hoc sach
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: ((((so sach) or (bo sach))) or (so sanh)) thi nang lai hoi. hieu ve pham thuc vat hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((so sach) OR (bo sach))) OR (so sanh)) thi nang lai hoi. hieu ve pham thuc vat hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: ((((so sach) or (bo sach))) or (so sanh)) thi nang lai hoi. hieu ve pham thuc vat hanh hai cua te*.