Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
dua tren » dung tren
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
ty nang » ky nang, ty hang, ly nang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve han » ve hanh, ve phan, ve ban
gia » giao

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) OR (ty xang)) mai hoi. hieu ve han quoc gia thanh lai ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty xang)) mai hoi. hieu ve han quoc gia thanh lai ((dua tren) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ty xang)) mai hoi. hieu ve han quoc gia thanh lai ((dua tren) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ty xang)) mai hoi. hieu ve han quoc gia thanh lai ((dua tren) or (cau tren))*.