Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
vat hanh » vat thanh, van hanh, va hanh
va trien » va truyen, va thiet, va tuyen
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
vi va » vi van, vai va, vu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (so sach)) ky nang xa hoi. hieu van pham thuc vat hanh vi va trien~.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (so sach)) ky nang xa hoi. hieu van pham thuc vat hanh vi va trien*.