Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, viet thanh
tat thanh » tai thanh, ta thanh, tat thang
nam thuc » nam thuoc, am thuc, nam thu
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tu » cua tuc, cua cu, cua te
vu sac » vu sach, vu san, va sac
ve nam » he nam, va nam, le nam
sac ky » cac ky, sai ky
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky lang xa hoi. hieu ve nam thuc ((vat thanh) OR (tat thanh)) vi ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky lang xa hoi. hieu ve nam thuc ((vat thanh) OR (tat thanh)) vi ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky lang xa hoi. hieu ve nam thuc ((vat thanh) OR (tat thanh)) vi ((cua tu) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: vu sac ky lang xa hoi. hieu ve nam thuc ((vat thanh) OR (tat thanh)) vi ((cua tu) or (cua su))*.