Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cam cua » ca cua, nam cua, lam cua
cau cua » cau qua, ca cua, cu cua
ban han » ban hang, ban hanh, ban than
han tai » hang tai, nhan tai, van tai
tai cau » tai cac, tai cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuat lanh)) ky nang xa hoi. hieu van ((cam cua) OR (cau cua)) ban han tai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat lanh)) ky nang xa hoi. hieu van ((cam cua) OR (cau cua)) ban han tai cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuat lanh)) ky nang xa hoi. hieu van ((cam cua) OR (cau cua)) ban han tai cau tren*".