Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, le thanh
sach ty » sach y, sach tu, sach thu
va tinh » may tinh
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va danh, ban hanh
cam tu » cam thu, nam tu, dam tu
va cam » va cham, va cac, va cao
di cau » da cau, diem cau

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 ty nang xa hoi. hieu va cam tu ((va hanh) or (((va thanh) OR (va tinh)))) di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu va cam tu ((va hanh) OR (((va thanh) OR (va tinh)))) di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu va cam tu ((va hanh) or (((va thanh) OR (va tinh)))) di cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu va cam tu ((va hanh) or (((va thanh) OR (va tinh)))) di cau tren*.