Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nang tai » hang tai, sang tai, nang cao
tang tai » hang tai, dung tai, sang tao
van hanh » ban hanh, van anh, van ban
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc ((van hanh) OR (van thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky ((nang tai) OR (tang tai)) roi. hieu ve cam luc ((van hanh) OR (van thanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc ((van hanh) OR (van thanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc ((van hanh) OR (van thanh)) dai cua tre*.