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

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach 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 sach 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 sach ky nang xa hoi. hieu vi pham thuc ((day hanh) or (dac nhan)) de ((cua tre) or (cau tren))*.