Perhaps you should try some spelling variations:
khach ky » thanh ky
cac thoi » cac toi, cac hop, cac tro
hieu van » hieu va, thien van, lieu va
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cac tac » cac toc, cac bac, cac dac
tang xa » trang xa, tang ma, lang xa
hanh ky » hanh kem
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((khach ky) OR (hanh ky)) tang xa hoi. hieu van ((cac tac) or (cac thoi)) va tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khach ky) OR (hanh ky)) tang xa hoi. hieu van ((cac tac) OR (cac thoi)) va tinh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khach ky) OR (hanh ky)) tang xa hoi. hieu van ((cac tac) or (cac thoi)) va tinh vi cuu tre*".