Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tham luc » than luc, tham nuoc, tham thuc
than duc » tran duc, phan duc, than doc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
lai cua » dai cua, hai cua, lai chau
tu sac » tu sach, tu cac, tu san
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: tu sac ky lang xa hoi. hieu van ((tham luc) or (than duc)) van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu van ((tham luc) OR (than duc)) van hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu van ((tham luc) or (than duc)) van hanh lai cua viet*.