Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cam luoc » cam xuc, tom luoc, cam lo
van hanh » ban hanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
le cua » ly cua
te sac » te sach, te cac, te san
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: te sac ((ky lang) OR (ky tang)) xa hoi. hieu ve cam luoc ((van hanh) or (van thanh)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky tang)) xa hoi. hieu ve cam luoc ((van hanh) OR (van thanh)) le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) OR (ky tang)) xa hoi. hieu ve cam luoc ((van hanh) or (van thanh)) le cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) OR (ky tang)) xa hoi. hieu ve cam luoc ((van hanh) or (van thanh)) le cua tre*.