Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (cac ky)) nang xa hoi. hieu van cac ((luc va) or (thuc dan)) hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (cac ky)) nang xa hoi. hieu van cac ((luc va) OR (thuc dan)) hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (cac ky)) nang xa hoi. hieu van cac ((luc va) or (thuc dan)) hanh hai cua tu*.