Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van quang » van quan, tran quang, van tuan
truc van » truc va, thuc van, truc ban
sau truc » cau truc, sach truc, tu truc
vien sau » vien dai, vien da, nien su
nang ma » tang ma, sang ma, nang cao
va nang » van nang, da nang, cam nang
bo sach » co sach, hoc sach
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
di su » doi su, da su, de su
ki su » ky su

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) or (bo sach)) va nang ma hoi. hieu vien sau truc van quang ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) va nang ma hoi. hieu vien sau truc van quang ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) va nang ma hoi. hieu vien sau truc van quang ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) va nang ma hoi. hieu vien sau truc van quang ((di su) OR (ki su)) triet*.