Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh tai » thanh tai, hang tai, hinh tai
cham duc » pham duc, cham soc, pham duy
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc tan, duc manh
nang ma » tang ma, sang ma, nang cao
han tai » hang tai, nhan tai, van tai
thu sac » thu sach, thu san, thu xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang ma) or (nang x)) hoi. hieu vu cham duc van ((hanh tai) or (han tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang ma) OR (nang x)) hoi. hieu vu cham duc van ((hanh tai) OR (han tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang ma) or (nang x)) hoi. hieu vu cham duc van ((hanh tai) or (han tai)) cua viet*.