Perhaps you should try some spelling variations:
vat thanh » gat thanh, tat thanh, viet thanh
dat thanh » dao thanh, dat khanh, dang thanh
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
doi cua » dai cua, hoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu van nam thuc ((vat thanh) OR (dat thanh)) doi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu van nam thuc ((vat thanh) OR (dat thanh)) doi cua viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van nam thuc ((vat thanh) OR (dat thanh)) doi cua viet*.