Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau phuc » cau truc, huu phuc, van phuc
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
chau phu » chau phi, chau au, chau tho
sach ty » sach y, sach tu, sach thu
cao hoc » co hoc, cho hoc, chat hoc
ty nang » ky nang, ty xang, ty hang
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang cao hoc. hieu van ((cau phuc) OR (chau phu)) van hanh ((vi cua) or (di cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang cao hoc. hieu van ((cau phuc) OR (chau phu)) van hanh ((vi cua) OR (di cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang cao hoc. hieu van ((cau phuc) OR (chau phu)) van hanh ((vi cua) or (di cua)) cau*".