Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
cam truc » cau truc, nam truc, lam truoc
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
vu khac » vu kham, vu khanh, bui khac
qua cam » qua cham, qua cac, qua ca
doi cua » dai cua, hoi cua
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 bach) or (vu khac)) ky nang x ho. hieu qua cam truc van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (vu khac)) ky nang x ho. hieu qua cam truc van hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (vu khac)) ky nang x ho. hieu qua cam truc van hanh doi cua tre*.