Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
cau theo » cau thi, cau tao
vu sach » vu bach, su sach, vu khach
lang ha » long ha
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cau » va cau, ve cau, di cau

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 y ((nang x) or (lang ha)) hoi. hieu va ((cham duc) OR (pham duc)) va danh vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang x) OR (lang ha)) hoi. hieu va ((cham duc) OR (pham duc)) va danh vi cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang x) or (lang ha)) hoi. hieu va ((cham duc) OR (pham duc)) va danh vi cau theo".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang x) or (lang ha)) hoi. hieu va ((cham duc) OR (pham duc)) va danh vi cau theo*.