Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
toc sach » hoc sach, doc sach, thuoc sach
doi hoat » toi hoat, doi hoac, voi hoat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thu vat » thuc vat, thu va, thuat vat
doi hoa » doi hoac, do hoa, boi hoa
va nam » van nam, ha nam, va nay

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 va nam thu vat thanh ((doi hoa) OR (doi hoat)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va nam thu vat thanh ((doi hoa) OR (doi hoat)) viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va nam thu vat thanh ((doi hoa) OR (doi hoat)) viet*.