Perhaps you should try some spelling variations:
thang dau » hang dau, xang dau, thanh dat
ke thang » ke trang, le thang, ke thuong
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
hieu ke » hieu kem, chieu ke, hieu ky
va hanh » van hanh, va danh, ban hanh
ty nang » ty xang, ty hang, ly nang
vu sach » vu bach, su sach, vu khach
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty nang) OR (ky nang)) xa hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ky nang)) xa hoi. hieu ke thang dau ((va hanh) OR (va thanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty nang) OR (ky nang)) xa hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) OR (ky nang)) xa hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki su triet*.