Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thanh de » hanh de, thanh ve, thanh do
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
tu sac » tu sach, tu cac, tu san

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) or (ky tang)) xa hoi. hieu van pham duc tan thanh de ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van pham duc tan thanh de ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky lang) or (ky tang)) xa hoi. hieu van pham duc tan thanh de ((su triet) or (cua viet))*.