Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vu khach » vu khanh, vu khac, vay khach
dac nhan » cac nhan, danh nhan, ca nhan
khach ky » hanh ky, thanh ky
day hanh » day nhanh, day thanh, dao hanh
cau tren » cu tren, dau tren, ca tren
hieu vi » hieu voi, hieu va, hieu ve
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ky nang xa hoi. hieu vi pham thuc ((day hanh) or (dac nhan)) de ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang xa hoi. hieu vi pham thuc ((day hanh) OR (dac nhan)) de ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang xa hoi. hieu vi pham thuc ((day hanh) or (dac nhan)) de ((cua tre) or (cau tren))*.