Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cham tuc » nham thuc, tham thuc, cham soc
sang tay » sang tao, sang tai, sang tac
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
ky sang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky sang tay hoi. hieu ve ((cham tuc) or (pham thuc)) va doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky sang tay hoi. hieu ve ((cham tuc) OR (pham thuc)) va doan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky sang tay hoi. hieu ve ((cham tuc) or (pham thuc)) va doan vi cua tre*.