Perhaps you should try some spelling variations:
giam thanh » gia thanh, gian thanh, giay thanh
te sach » toc sach
vu giam » vu giao, va giam, vu gia
dai huu » dao huu, dai hau, dai thua
dai cuu » dai cua
hieu ve » hieu va, hieu van
y nang » ly nang, v nang, may nang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
cac vu » cac du, cac vi, cac tu

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 ((y nang) OR (ky nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) or (dai huu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) OR (dai huu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ky nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) or (dai huu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ky nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) or (dai huu)) tre*.