Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
pham thuc » pham chuc, nham thuc, pham thu
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dan hanh » dang hanh, dan khanh, dan thanh
nang doc » nang luc
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang noi, nang hoc
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang co) or (nang doc)) hoc. hieu van ((pham thuc) OR (phap thuc)) dan hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang co) OR (nang doc)) hoc. hieu van ((pham thuc) OR (phap thuc)) dan hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang co) or (nang doc)) hoc. hieu van ((pham thuc) OR (phap thuc)) dan hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang co) or (nang doc)) hoc. hieu van ((pham thuc) OR (phap thuc)) dan hanh de cua te*.