Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, hoang van
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y lang van hoa. hieu va ((tham thuc) or (pham thuc)) van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y lang van hoa. hieu va ((tham thuc) OR (pham thuc)) van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y lang van hoa. hieu va ((tham thuc) or (pham thuc)) van hanh va cua tre*.