Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
tuan kem » tuan kiet, tuan kien, tuan le
dua tren » dung tren
cau theo » cau thi, cau tao
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van

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 x ho. ((hieu ve) OR (hieu va)) cam luc van tuan kem ((dua tren) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x ho. ((hieu ve) OR (hieu va)) cam luc van tuan kem ((dua tren) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x ho. ((hieu ve) OR (hieu va)) cam luc van tuan kem ((dua tren) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. ((hieu ve) OR (hieu va)) cam luc van tuan kem ((dua tren) or (cau theo))*.