Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
dau cua » day cua, cau cua, dan cua
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va

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 ky nang mai hoi. hieu su cham ((soc va) or (doc va)) dan ((dau cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. hieu su cham ((soc va) OR (doc va)) dan ((dau cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai hoi. hieu su cham ((soc va) or (doc va)) dan ((dau cua) or (dai cua)) te*.