Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, gian cac
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
tai cua » thai cua, tai cuc, tri cua
sach ly » sach y, sach lo, sach ty
vien da » vien dai
xuc van » duc van, luc van, vuc van
cua tu » cua tuc, cua su, cua cu
hien » bien, tien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly nang xa hoi. hieu ((((vien cac) OR (vien da))) or (hien dai)) xuc van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang xa hoi. hieu ((((vien cac) OR (vien da))) OR (hien dai)) xuc van hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang xa hoi. hieu ((((vien cac) OR (vien da))) or (hien dai)) xuc van hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang xa hoi. hieu ((((vien cac) OR (vien da))) or (hien dai)) xuc van hanh tai cua tu*.