Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
sang ma » tang ma, sang tao, mang may
sach ty » sach y, sach tu, sach thu
nam luc » nang luc, nhan luc, nam thuc
luc van » luoc van, luu van, duc van
nang ma » tang ma, nang cao, mang may
hanh ve » hanh vi, hanh va, hanh kem
tu sach » thu sach, su sach, te sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (sang ma)) hoi. hieu van nam luc van ((hanh ve) OR (thanh vien)) va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ma) OR (sang ma)) hoi. hieu van nam luc van ((hanh ve) or (thanh vien)) va trien~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) OR (sang ma)) hoi. hieu van nam luc van ((hanh ve) or (thanh vien)) va trien*.