Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
ve cham » va cham, ve chat, vu cham
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau
ve cam » ve cac, va cam, ve cai
xa dan » ca dan, xa dai, va dan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cao hoi. hieu ((ve cam) or (ve cham)) tuc xa dan can cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ((ve cam) OR (ve cham)) tuc xa dan can cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ((ve cam) or (ve cham)) tuc xa dan can cau tren*.