Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
tuc van » thuc van, truc van, duc van
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
tuc va » thuc va, truc va, tuc xa
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang xa hoi. lieu va cau ((tuc van) or (tuc va)) hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. lieu va cau ((tuc van) OR (tuc va)) hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. lieu va cau ((tuc van) or (tuc va)) hanh vi dau tren*.